chis4yu
Newbie level 4
Hi,
I'm a little confused by DFT compiler and usage.
I understand that the normal clock is defined as the ScanClock with existing_dft
but I'm adding a bypass MUX in RTL.
Seems like the clock used for scan chain insertion ALWAYS uses functional clk name. In this case : clk.
Seems like the assumption is that "clk" will ALWAYS be the scan and capture clock.
what's the correct DFT compiler commands to add scan to module XYZ ?
How to handle and describe scanrst, scanclk to properly insert scan chain and connect to scanrst, scanclk ?
What's the correct syntax for the "set_dft_signal -view spec" to create the scan chains for "insert_dft"
Thanks
I'm a little confused by DFT compiler and usage.
I understand that the normal clock is defined as the ScanClock with existing_dft
but I'm adding a bypass MUX in RTL.
Seems like the clock used for scan chain insertion ALWAYS uses functional clk name. In this case : clk.
Seems like the assumption is that "clk" will ALWAYS be the scan and capture clock.
Code dot - [expand] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 module ABC (clk, rst, d, q) always @(posedge clk or posedge rst) if (rst) q <= '0; else q <= d; endmodule module XYZ (clk, scanclk, rst, scanrst, d, q, TestMode) assign clk_bypass = TestMode ? scanclk : clk; // if TestMode then use scanclk else use functional clock ABC i_ABC (.clk(clk_bypass), .rst(rst_bypass), .d(d), .q(q) ); endmodule
what's the correct DFT compiler commands to add scan to module XYZ ?
Code dot - [expand] 1 2 3 set_dft_signal -view existing_dft -ScanClock -port clk set_dft_signal -view existing_dft -ScanReset -port rst set_dft_signal -view existing_dft -type Constant -active 1 -port TestMode
How to handle and describe scanrst, scanclk to properly insert scan chain and connect to scanrst, scanclk ?
What's the correct syntax for the "set_dft_signal -view spec" to create the scan chains for "insert_dft"
Code dot - [expand] 1 2 3 set_dft_signal -view spec -ScanClock -port clk set_dft_signal -view spec -ScanReset -port rst set_dft_signal -view spec -type Constant -active 1 -port TestMode
Thanks
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